The stay-at-home mum from East London, was referred to the hospital to have a tooth extracted in January 2014 after experiencing inflammation and severe pain in her gums, but immediately after the procedure Katie felt something had gone wrong.

She said: “I thought everything was fine at first but the following day I knew something wasn’t right.

“My lips and the side of my chin felt completely numb. My gums still hurt and I couldn’t eat properly because of the numbness.”

She made another appointment at Whipps Cross University Hospital where she was told it could take 18 months for her mouth to return to normal.